as per the title. decided to lay a new fllor. fresh ply. do i need to prime it? thanks guys. ill get the hang of this yet.

Read the instructions on ya adhesive bag.....normally you do not prime face side of ply but check with manufacturer first...

I always prime wood as even marine ply will take in water and as plywood coming into UK is not as good as it was several years ago a thin coat of a good primer helps with adhesion

cheers forn the reply's.

tend to give most ply a coat of primer now,for all it costs its better to be safe than sorry!

Originally Posted by david campbell

tend to give most ply a coat of primer now,for all it costs its better to be safe than sorry!

....though it would probably invalidate any guarantee from BAL if you used their products!

Originally Posted by grumpygrouter

....though it would probably invalidate any guarantee from BAL if you used their products!

Wot doesn't..

Originally Posted by Dave

Wot doesn't..

..

dont use Bal much really and i know what Russ is saying but im with Davy on this one ,i always prime ply face side.

Originally Posted by grumpygrouter

....though it would probably invalidate any guarantee from BAL if you used their products!

even if your using bal primer..... for wood!

Hi mate, really depends upon which brand and type of adhesive you use. I use mapei keraquick ply floors. No need to prime

Davy apparantly yes as you have not followed the exact BAL instructions on the bag...they say to prime the underside of ply....side that goes against the substrate.

hi guy's. i am using topps trade multi flex adhesive. i read the very small print and it did say i needed a primer. typical. shops shut now. ill prime it all tomorrow. thanks for all the advice guys.

AlThough I mentioned that most Mapei adhesives are suitable for ply without priming, they do make a primer suitable for plywood, primarily used prior to self levelling, although the PDF data sheet says also suitable for preparation prior to applying cementious adhesives.
see PDF data sheet
Eco Prim T

http://www.mapei.it/Referenze/Multim...rim%20t_gb.pdf

cheers for that mate.

No problem

altho' you may not need to prime ply with every addy that you choose, you'll need to use a primer to seal the underside and edges of ply to eliminate delamination by moisture ingress

Thanks Doug, something that I have never done before as have never been advised to, even by any of the tilers I work with who, have been tiling 25 years plus and have all their quals. Will certainly do this in the future. No come backs so far.
Thanks for the advice

Originally Posted by Leatherface

Thanks Doug, something that I have never done before as have never been advised to, even by any of the tilers I work with who, have been tiling 25 years plus and have all their quals. Will certainly do this in the future. No come backs so far.
Thanks for the advice

I'm now into my 28th year (tiling and plastering) and I believe that we're never to old to learn

Only been at it 4 years, still a lot to learn !

Originally Posted by Leatherface

Only been at it 4 years, still a lot to learn !

the day you stop learning Nick, is the day it'll get boring! luckily I'm still learning and not getting bored